Determining Size Of Pipe To Install
To determine what diameter pipe to use in an installation (3” or 4”), first find the “equivalent pipe length” using the following guidelines, then plot this Figure and the altitude on the chart.
Fill out the installation chart, and calculate your total equivalent pipe length. After you have the total equivalent pipe length, use the Pipe Selection Chart below to determine if your installation requires 3” or 4” exhaust pipe.
Installation Chart
Type of Pipe | # of Elbows or |
| Equivalent Feet | Total Equivalent |
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90¡ Elbows / |
| x | 5 Feet |
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Tee (A & G) |
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45¡ Elbows |
| x | 3 Feet |
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(C) |
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Horizontal |
| x | 1 foot |
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(B & F) |
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Vertical(E) |
| x | .5 Feet |
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Table 5 |
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Sample Installation Chart |
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Type of Pipe | # of Elbows or |
| Equivalent Feet | Total Equivalent |
| Feet of pipe |
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90¡ Elbows / | 2 | x | 5 Feet | 10 Feet |
Tee (A & G) |
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| (1.5 meters) | (3 meters) |
45¡ Elbows | 1 | x | 3 Feet | 3 Feet |
(C) |
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| (1 meter) | (1 meters) |
Horizontal | 3 | x | 1 foot | 3 Feet |
(B & F) |
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| (.3 meters) | (1 meter) |
Vertical(E) | 8 | x | .5 Feet | 4 Feet |
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| (.15 meters) | (1.2 meters) |
Table 6 - Sample Chart for Figure 16 |
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(Feet) |
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| 4 Inch Diameter Only |
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20 |
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Length |
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| 3 or 4 Inch |
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Pipe |
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10 |
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Equivalent |
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0 |
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| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Altitude x 1000 Feet
Figure 19 - Pipe Selection Chart
B
NOTE: All equivalent pipe styles shown are standard for all free- standing models.
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A- 90 Degree Elbow |
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B- 1Õ Horizontal Pipe |
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C- 45 Degree Elbow |
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D- Standoff Braces |
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E- 8Õ Vertical Pipe |
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F- 2Õ Horizontal Pipe |
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G- 90 Degree Tee |
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H- Wall Thimble |
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Figure 20 - See Sample Installation Chart |
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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE | 13 |